Norris peters



1 ELECTROMAGNETIC WAVE TRANSMITTING SYSTEM.

APPLICATION FILED Nov. 4. 191a. muzwzn JAN. 19, 192.

1,369,281. Patented Feb. 22, 1921.

2 SHEETSSHEET l- M CYM NORHIS PEYEIS. INC LITHU" WASHINGTON D. C

ELECTROMAGNETIC WAVE TRANSUITTING SYSTEM. APPLICATION FILED NOV.4, I918. RENEWED JAN. 19,1921.

1,369,281. Patented Feb. 22,1921.

l 2 $HEETSSHEET 2. L 1 1229. 4.

v liwenior A NORRIS PETERS. lNc.. Lmm, WASHINGTON. D C

UNITED STATES PATE'NT OFFICE.

OSCAR C. 300$, BROOKLYN, N EW YORK.

ELECTBOMAGNETIC-WAVE-TRANSMITTING SYSTEM.

Application filed November 4, 1918, Serial No. 261,008.

To allwhomrz't may concern Be it known that I, Gsoan C. Roos, a citizen of the United States, and :a resident of Brooklyn, in the county of Kings and State o New York, have invented anew and use tul Improvement in Electromagnetic-lvave- Transmitting Systems of which the following is a specification.

My'iuvention relates to electromagnetic- Wave transmitting systems ans more especially to systems which are energized by substantially continuous oscillations such as those developed by an oscillating arc circuit.

In systems of this type the oscillations developed in the antenna are, in general, multipei'iodic and one of the objects of the present invention is to provide means for absorbing one or more of the higher harmonics of the id'amental of the antenna system so that me transmitted electromagnetic r aves will have the frequency of sucl. fundamental and will be substantially simple harmonic. An-

other object is to provide means for absorbing the fundamental or said fundamental and one ormore of the harmonics thereoi' so that the transmitted electromagnetic waves will have higher frequency than said fundamental and will be substantially simple harmonic In general my object is to provide means whereby oscillations of the-undesired or parasitic frequencies are absorbed and the remaining oscillations transmitted.

as electromagnetic waves. A further object is to provide means for re-ctlfying the oscil laticns so absorbed and for impressing the resulting unidirectional current on the ar circuit. Apparatus of the general type described herein is disclosed in my Patent No. 1,309,778, dated July 15, 1919, and the claims the present case are directed to modifications thereof in the nature of simplifications and improvements.

Several illustrative embodiments of my invention are shownconventionally in the accompanying drawings but it will be understood that various modifications may be made both in the apparatus and the system of circuits without departing from the princinle of my invention. 7

In the drawings- Figure l is a diagram of an electromagnetic transmitting system involving my invention in its simplest form wherein the energy of one harmonic of the antenna Specification of Letters Patent.

Patented Feb. 22, 1921. Renewed January 19, 1921. Serial No. 438,522.

fundamental 01' of said fundamental itself is absorbed by a circuit eonductively connected to the antenna. Fig. 2 is a similar diagram of a modification. Fig. 3 is 3. dia gram of a further modification. Fig. 4 is a diagram of a transmitting system provided with a circuit for absorbing the energy of two frequencies which may be either two harmonics or else the fundamental and one harmonic. Fig. 5 is a diagram of another arrangement whereby the energy of two frequencies is absorbed. Fig. 6 is a diagram of a transmitting system for absorbing the energy of three frequencies.

In each of the figures a transmitting antenna T connected to earth at E includes the arc electrodes A. shunted by the condenser C and connected to the direct current generator G through choke coils I, I, the circuit A C, togetherwith the antenna and its loading coil L, constituting an oscillating-arc cir cuit.

In Fig. 1 there is conductively connected to the antenna and preferably across the are a highly selective circuit which includes the condenser C and inductance L, said circuit being resonant to a parasitic or nonuseful frequency so that it will absorb the energy of su h frequency. The oscillations which it is desired to use will be blocked by the circuit C L. which will have a very high impedance for the same.

As is well understood it is impossible to develop oscillations of relatively high fre quencies by an oscillating-arccircuit. If, therefora'the circuit C L be attuned to the fundamental the radiated waves will be those resulting from one or more of the higher harmonics of the fundamental and will be much shorter than those corresponding to the fundamental. As hereinafter more fully explained means may be provided for absorbing the fundamental oscillation and as many of the higher harmonics as desired. so that the transmitted waves will not only have a higher frequency than the fundamentalbut will be substantially simple harmonica 1 r If desired a regenerative circuit may be employed whereby the energy of the oscillation which is absorbed by the resonant circuit may lie-rectified and the resulting unidirectional current employed for assisting the source G in feeding the are. In the present instance the regenerative circuit is shown as inductively connected with the resonant circuit C L by the transformer P S, the primary of which is serially connected with the resonant circuit and the secondary with the rectifier V, the latter being connected through the regulator R and choke coils I, I to the are.

It will be understood, however, that my system for purifying the oscillations developed in the antenna is not limited to systems in which an oscillating arc is employed.

In Fig. 2 the absorbing circuit includes the parallel-branch circuit one branch of which contains the condenser C or an equivalent capacity and the other the inductance l which in the present instance is shown as the primary of a transformer, or an equivalent inductance, said. parallelbranch circuit being serially connected with a tuning element shown in the present instance as the inductance if, such conductively connected circuit being attuned either to the fundamental or one of the harmonics thereof, 2'. c. to one of the non-useful parasitic frequencies, and said parallelbranch circuit being attuned so as to have a maximum or high impedance at the frequency to be radiated so that oscillations of said frequency will be blocked thereby. The energy of the oscillations absorbed by the conductivcly connected circuit will be translated to the secondary S and both pulses thereof rectified by the device V, and the resulting unidirectional current delivered to V the arc throue'h the re 'ulator R andthc choke coils I. In Fig. 3 the parallelhrz'inch circuit includes the condenser C and the inductance L and serially connected with a tuning element shown in the present instance as the primary P of a transformer the secondary S of which is connected to the IGCliliGl V. A. storage battery R is included in the regenerative circuit and peri illllla the same function as the regulator R shove referred to in connection with Figs. l and 2.

in general the parallel-branch circuit will have a capacity reactance for oscillations of the frequency which it is desired to absorb hese are usually of higher frequency tie oscillation to he radiated, so that tuningelement l or P as the case may he will in cneral an inductance reactance and ijorsimplicity n'iay he an inductance itself.

Extensions of the s 'stems shown in their simplest ferm's in F l, 2, and 3 are represented in Figs. i, 5, and 6.

in Fig. 4- the parallehbranch circuit C is st 'ially coiniccted with aseries reso naut circuit if C, and the parailel-branch circuit C l. i serially connected with the series resonant circuitli C. The parallel? branch circuits each attuned to the frequency of the useful oscillation or the oscillatien to be radiated, which oscillation may either be the fundamental or a harmonic thereof, and each circuit C P L C and U .l L C is attuned so as to have a low impedance at the frequencies, respectively, of two of the parasitic oscillations which are to be absorbed. Thus if one of the circuits is attuned to the fundamental and the other to the first harmonic thereof the radiated wave will have a higher frequency than the first harmonic and will be more nearly sinusoidal than if only one such circuit were employed. As will be obvious I may use as many such circuits as may be desired for the purpose of rendering the transmitted wave as nearly simple harmonic as possible. in view of what has been said in connection with Fig. 1 it will be apparent that the parallelbranch circuits P and C l may be omitted in cases where the series resenan circuits L C and L C are made highly selective. r

The energy of the absorbed oscillations is translated to the secondaries S which are connected in series with each other and with the rectifier V, and the resulting unidirectional current is conveyed to the are by the leads which include the choke coils 1 ani regulator R.

The preferred form of my invention is shown in Fig. 5. In 4t the position of the parallel-branch circuits is such that sep a rate circuits each havingmaximum or high impedance at the usciul frequencies and minimum or low impedance at the parasitic or undesired frequencies are connected across the arc. The same result may be obtained more simply by arranging the circuits in the manner shown in Fig. 5. The circuit C P is attuned to one parasitic frequency and the circuit C P to another, and they are connected in with each other and in shunt to the are. The circuit- CT L is tuned so that the combined branch re actances of the circuits C 1' and C P equal and opposite in phase to its own reaclauce at the useful frequency, thereby causing the combined parallel-branch reactance of the circuits C and the circuits P, C P to be a maximum or at least very high at the desired frequency thereby blocking the latter in the same way that such useful or desired frequency is blocked in the systems shown. in Figs. 52, 3 and i.

By way of specific example C P may be attuned to the first harmonic of the antenna fundamental, C P to the second harmonic and C If to a frequency lower than said fundamental. in such case at the frequency of the fundamental the circuits 0* and C P will. each have a capacity reactanee and the circuit C U will have an inductance reactance. By rendering these two reactances equal an equivalent parallel-branch circuit is formed, the condenser branch ltlll being formed by the circuits G P and C P which as above stated have capacity re actances' at the frequency of the fundamental, and the inductance branch being formed by the circuit'C If which at the fundamental frequency has an inductance reactance. Thus there is in effect connected across the are a circuit which is anti-resoiiant at the frequency of the fundamental :i i resonant to two harmonics thereof.

it will be understood of course that the arrangen'ient shown in Fig. 5 may be adjust ed to absorb the fundamental and one of the harmonics thereof as well. as two harmonies. f

The energy of the absorbed oscillation is conveyed to the rectifier V by the serially connected secondaries S S.

In Fig. 6 which is an extension of the arrangement shown in Fig. 5 three series resonant circuits C P, C P, C P are connected across the arc and each is attuned to one of the non-useful frequencies. In shunt to the arc and to the series resonant circuits is acircuit C L 'the function of which is the same as that of the circuit C L 'of Fig. 5. In this instance I have shown three rectifiers V. V V connected respectively with the secondaries S S S, and said rectifiers are connected to the arc terminals through leads which include the choke coils I Obviously as many such series resonant circuits may be used as desired.

In Figs. 4, 5 and 6 the circuit which is conductively connected across the arc will have a maximum or high impedance at the frequency of the fundamental of the antenna system or at the frequency of the harmonic to be radiated, and a low or substantially minimum impedance at each of the frequencies of the oscillations which are not in'-' tended to be radiated.

By the term oscillatingarc circuit as used herein I desire to be understood as 2 meaning'a circuit which includes a condenser and arc-electrodes or other device or devices so arranged that when said circuit is energized by direct current substantially continuous oscillations are produced.

Having described illustrative embodiments of my invention without however lim-' itmg the same thereto what I claim and (le sire to secure by Letters Patent is:

1. An electromagnetic-wave transmitting system comprising in combination an antenna system. means for creating electrical oscillations therein, and a circuit associated with the antenna and including means for attunin'g said circuit so as to have a maximum impedance at the frequency of the fundamental of said antenna system and a substantially minimum impedance at each of the frequencies of'a plurality of the har moni s'of said fundamental. p

2. An electromagnetic-wave transmitting radiated and a tuning element in s.

system comprising in combination an antenna system, means for creating electrical oscillations therein, and'a circuit conductively' connected to the antennaand including means for attuningsaid circuit so as to have a maximum impedance at the frequency of the fundamental of said antenna system and a substantially minimum impedance at each of the frequencies of. a plurality of the harmonics of said fundamental.

3. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating electrical oscillations therein, and circuit associated with the antenna and including a plurality of parallel-branch circuits, one branch of each of which contains a capacity and the other an inductance, each of'said parallelbranch circuitsbeing attuned tothe fre quency of the oscillation that is to be ra diatcd' and a tuning element in with each of said parallel-branch circuits.

4. An electromagnetic-wave transmitting.

system comprising in combination an antenna system, means for creating electrical oscillations therein, a circuit associated with the antenna and including plurality of parallel-branch circuits, one branch of each of which acts as an equivalent capacity and the other as an equivalent inductance, each of saidparallel-branch circuits being attuned to the frequency of the oscillation that is to liii with each of said parallehbranch circuits.

5. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating electrical oscillations therein, a circuit associated with the antenna and including a plurality of parallel-branch circuits, one branch of each of which acts as an equivalent capacity and e the other as an equivalent inductance, and a tuning element in series with each of said parallel-branch circuits, the first mentioned circuit bein'gadjusted to have a maximum impedance at the frequency of the fundamental of said antenna system and a sub stantially minimum impedance at each of the frequencies'of a plurality of the harmonics of said fundamental.

6. An electromagnetic-wave transmitting system comprising in combination an antennasystem, means for creating electrical oscillations therein, and a circuit associated with the antenna and including a plurality of parallel-branch circuits, one branch of each of which contains a. capacity and the other an inductance, each of'said parallelbranch circuits being attuned to the frequency of the oscillation that is to be radiated and a series resonant circuit serially connected with circuits.

7. An electromagneticuvave transmitting system comprising in combination an aneach of said parallel-branch tenna system, means for creating electrical oscillations therein, a circuit associated with the antenna and including a plurality of parallel-branch circuits, one branch of which acts as an equivalent capacity and the other as an equivalent inductance, each of said parallel-branch circuits being attuned to the frequency of the oscillation that is to be radiated, and ascries resonant circuit serially connected with each of said parallel-branch circuits.

8. An electromagnetic-wave transmitting system, comprising in combination an antenna system, an oscillating-arc circuit arranged for creating electrical oscillations therein, arcircuit conductively connected to the antenna and attuned-to one of the harmonies of the fundamental thereof, means associated with the last mentioned circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidirectional. current on the arc circuit.

9. An electromagnetic-wave transmitting system, comprising 111 combination an antenna system, an oscillating-arc circuit arranged for creating electrical. oscillations therein, a circuit conductively connected to the antenna and attuned so as to have a maximum impedance at the frequency of the fundamental of said antenna system and a minimum impedance at the frequency of one of the harmonics of said fundamental, means associated with the last mentioned circuit for rectifying the oscillations absorbedctherein and means for impressing the resulting unidirectional current on the arc circuit.

10. An electromagnetic-wave transmitting system, comprising in combination an antenna system, an oscillating-arc circuit ar ranged for creating electrical oscillations therein, a circuit conductively connected to the antenna and attuned to one of the harmonies of the fundamental thereof, means associated with the last mentioned circuit for rectifying boththe positive and the negative pulses of the oscillations absorbed therein and means for impressing the resultingunidirectional current on the are circuit. V V V a 11. An electromagnetic-wave transmitting system, comprising in combination an antenna system, an oscillatingnrc circuit arranged for creating electrical oscillations therein, a circuit conductively connected to the antenna and attuned so as to have a maximum impedance at the frequency of the fundamental of said antenna system and a minimum impedance at the frequency of one of the harmonics of said fundaniiental,

means associated with the last mentioned circuit for rectifying both the positive and the negative pulses of the oscillations absorbed therein and means for impressing the weasel,

resulting unidirectional current on the arc circuit.

12. A11 electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillatingerc circuit arranged for creating electrical oscillations therein, a circuit associated with the antenna and attuned so as to have a maximum impedance at the frequency'of the fundamental of said antenna system and a substantially minimum impedance at each of the frequencies of a plurality of the harmonics of said fundamental, means associated with the last mentioned circuit for rectifyin the oscillations absorbed therein, and means for impressing the resulting unidirectional ciju'rent on the arc circuit.

13. An electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillating; arc-circuit arranged for creating electrical oscillations therein, a circuit conductively connected to the antenna and attuned so as to have a maximum impedance at the frequency of the fundamental of said antenna system and a substantially minimum impedance at each of the frequencies of a plurality of the harmonics of said fundamental, means associated with the last mentioned circuit for rectifying the oscillations absorbed therein, and means for impressing the resulting unidirectional current on the arc circuit.

14:. An electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillatingarc circuit arranged for creating electrical oscillations therein, a second circuit associated with the antenna and including a plurality of parallel-branch circuits, one branch of each of which contains a capacity and the other an inductance, a tuning element in series with each of said parallel-branch circuits, means associated with said second circuit for rectifying the oscillations absorbed therein, and means for impressing; the resulting unidirectional current on the are circuit.

15. An electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillating-arc circuit arranged for creating electrical oscillations therein, a second circuitassociated with the antenna and including a plurality of parallel-branch circuits, one branch of each of which acts as an equivalent capacity and the other as an equivalent inductance, a tuning element in series with each of said parallel branchcircuits, means associated with said second circuit for rectifying the oscillations absorbed therein, and means for impressing the resulting unidirectional current on the arc circuit. 7

16. An electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillating-arc circuit arranged for creating electrical oscillations pluralityofthe harmonics of said fundamental, means associated with said second circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidirectional current on the arc circuit.

17 An electromagnetic-wave transmitting system, comprising in combination. an antenna system, means for creating multiperiodic electrical oscillations therein, a circuit conductively connected to the antenna and attuned to the frequency of one of the oscillations that is not to be radiated, and a parallel-branch circuit, one branch of which includes a capacity andthe other an inductance, serially connected with said circuit, said parallel-branch circuit being attuned to the frequency of the oscillationthat is to be radiated. i

.18. An electromagnetic-wave V transmitting system, comprising in combination an antenna system, means for creating multiperiodic electrical oscillations therein, a circuit conductively connected to the antenna and attuned to the frequency of one of the oscillations that is not to be radiated, and a parallel-branch circuit, one branch of which acts as an equivalent capacity and the other as an equivalent inductance, serially connected with said circuit, said parallelbranch circuit being so attuned as to have a maximum impedance at the frequency of the oscillation that is to be radiated.

19. An electromagnetic-wave transmitting system, comprising in combination an antenna system, means for creating multiperiodic electrical oscillations therein, a circuit conductively connected to the antenna and attuned to the frequency of one of the oscillations that is not to be radiated, and a parallel-branch circuit, one branch of which includes acapacity and the other an inductance, serially connected with said circuit, said parallel-branch circuit being so attuned as to have a maximum impedance at the frequency of the oscillation that is to be radiated.

20. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating multiperiodic electrical oscillations therein, and a circuit associated with theantenna and including means for attuning said circuit so as to have a maximum impedance at'the frequency of the oscillation to be radiated and a substantially minimum impedance at each of the frequencies of a pluralit of oscillations that are not to be radiated? 21. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating multiperiodic electrical oscillations therein, and a circuit conductively connected to the antenna and including meansfor attuning said circuit so as to have a maximum impedance at the frequency of the oscillation to be radiated and a substantially minimum impedance at each of the frequencies of a plurality of oscillations that are not to be radiated.

22. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating multiperiodic electricaloscillations therein, a circuit associated with the antenna and including a parallelrbranch circuit, one branch of which acts as an equivalent capacity and the other as an equivalent inductance, the first mentioned circuit including means for adjusting said circuit so as to have a maximum impedance at the frequency of the oscillationto be radiated and a substantially minimum impedance at each of the frequencies of a pluraliity of oscillations that are not to be radiate 23. An electromagnetic wave transmitting system comprising in combination an antenna system, an oscillating-arc circuit arranged for creating electrical oscillations therein,-a circuit conductively connected to the antenna and attuned to the frequency of one of the oscillations thatis not to-be radiated, means associated with the last mentioned circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidirectional current on the arc circuit.-

24:. An electromagnetic-wave transmitting system, comprising in combination an antenna system, an oscillating-arc circuit arranged for creating electrical oscillations therein, a circuit conductively connected to the antenna and attuned, so as to have a maximum impedance at the frequency of the oscillation that is to be radiated and a minimum impedance at the frequency'of one of the oscillations that is not to be radiated, means associated with the last mentioned circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidirectional current'on the arc circuit.

25. An electromagnetic-wave transmitting system comprising in combination an antenna system, anfioscillating-arc circuit arranged for creating electrical oscillations therein, a circuit associated with the antenna and attuned so as to have a maximum impedance at 'the'frequency of the pscillationto be radiated and a substantially minimum impedance at each of the frequencies of a plurality of oscillations that are not to be radiated, means associated with the lastmentioned circuit for lGCtliij/lllg the oscillations absorbed therein, and means for impressing the resulting unidirectional current on the arccircuit.

26. An electromagneticwave transmitting system comprising in combination an ing the oscillations absorbed therein, and

means for impressing the resulting unidirectional current on the arc circuit.

7 27. An electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillating-arc circuit arranged for creating electrical oscillation therein, a second circuit associated with the antenna and including aparallel -.branch circuit, one branch of which acts as an equivalent capacity and the other as an equivalent inductance, said second circuit being adjusted to have a maximum impedance at the frequency of the oscillation to be radiated and a substantially minimum impedance at each of the frequencies of a plurality of oscillations that are not to be radiated, means associated with said second circuit for rectifying the oscillations ab sorbed therein and means forimpressing the resulting unidirectional current on the arc circuit.

28. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating multiperiooic electrical oscillations therein, a piurality of series resonant circuits connected in multiple with saidineans and each attuned tot-he frequency of one of the oscillations that is not to be radiated, and another series resonant circuit also connected. in multiple with said means but attuned to a :t'requency different from those to which the first mentioned series resonant circuits are attuned, the reactance of the last named series resonant circuit for the frequency of the oscillations that are to be radiated being equal and opposite in phase to the combined branch reactances of the-first mentioned ries resonant circuits.

29. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating electrical oscillations therein, a circuit conductively connected to the antenna and attuned to one of the harmonics of the fundamental thereof, and a parallehbranch circuit, one branch Of which acts as an equivalent capacity and the other as an equivalent inductance, serially connected with said circuit, said parallel-branch circuit being so attuned as to have a high impedance at the fundamental of said antenna system. 7

30. An electromagnetic-wa transmitting system comprising in combination an an tenna system having a definite 'i'un ireqi'iency, an 'oscillating-arc circuit arrarg'ed for creating; therein cl *1" lations of said frequency, a c tively connected to the antenna and to one of the multiples said and a ai.allel-branch circuit, one i, i which at as an equivalent capacity and other as an equivalent inductance, 5 connected with the last mention said pHltLllGl-bl'tlllfill circuit being attuned so as to have a high impedance at the funda mental of the antenna system.

31. An clectromagnetic-w vetransmit-ting;- systcm comprising in combination an anno tenna system, means for creating electrical oscillations therein, and circuit associated with the antenna, and including means for attuning said circuit so as to have a high impedance at the frequency oi the fundamental of said antenna systei'n and a low impedance at each of the frequencies of aplurality of the harmonics of said fundamental.

32. An electrorm .etic-wav'e system comprising: in combinrn. tenna system. means for or oscillations therein, and ti'vely corn 1 to t; ingz; means i have a high loo i'isinitting the tan d aniental of 1 antenna sys a low impedance at each of the A of plural ty of the harmonics of tun d amental. l l I:

33. An elc toinagn'etic-wa' e transmitting system comprising in combinah a on till-- tcnna system, an oscillatingarc circuit arranged for creating electrical oscilla "as therein, a circuit couducti'rely owner the antenna and attuned as to hair impedance at the .ij'requency oi the A mental. of said antenna system an d a low pedance at the frequency of one of the harmonics of said fundamental, means associated with the last mentioned circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidirectional current on the arc circuit.

34. An electromagnetic-wave transmitting system comprising in combination an tenna systen an oscillatin rana'ed for creating elect h the antenna and attu or so as to have a high impedance 1% at the frequency of the fundamental of-said antenna system and a low impedance at each of the frequencies of a plurality of the harmonies of said fundamental, means associated with the last mentioned circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidirectional current on the arc circuit.

. 35. An electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillating-arc circuit ar ranged for creating electrical oscillations therein, a circuit conductively connected to the antenna and attuned so as to have a high impedance at the frequency of the fundamental of said antenna system and a low impedance at each of the frequencies of a plurality of the harmonics of said fundamental, means associated with the last mentioned circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidirectional current on the arc circuit.

36. An electromagnetic-Wave transmitting system comprising in combination an antenna system, an oscillating-arc circuit arranged for creating electrical oscillations therein, a second circuit associated with the antenna and including a plurality of pa"- allel-branch circuits, one branchof each of which acts as an equivalent capacity and the other as an equivalent inductance, a tuning element in series with each of said parallelbranch circuits, said second circuit being adjusted to have a high impedance at the frequency of the fundamental of the antennav system and a low impedance at each of the frequencies of a lurality of the harmonies of said fundamental, means associated with said second circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidi rectional current on the arc circuit.

37. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating multiperiodic electrical oscillations therein, a circuit conductively connected to the antenna and attuned to the frequency of one of the oscillations that is not to be radiated, and a 1 parallel-branch circuit, one branch of which acts as an equivalent capacity and the other as an equivalent inductance, serially connected with said circuit, said paraliel-branch circuit being so attuned as to have a high impedance at the frequency of the oscillation that is to be radiated.

38. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating multiperiodic electrical oscillationstherein, a circuit conductively connected to the antenna and attuned to the frequency of one of the oscillations that is not to be radiated, and a parallel-branch circuit, one branch of which includes a capacity and theother an inductance, serially connected with said circuit, said parallel-branch circuit being so attuned as to have a high impedance at the frequency of the oscillation that is to be raquency of the oscillation to be radiated and a low impedance at each of the frequencies of a plurality of oscillations that are not to be radiated.

d0. An electromagnetic-Wave transmitting system comprising in combi ation an antenna system, means for creatingmultiperiodic electrical oscillaticns therein, and a circuit conductively connected to the antenna and including means for attuning said circuit so as to have a high impedance at the frequency of the oscillation to be radiated and a low impedance at each of the frequencies of a plurality ofoscillations that are not to be radiated.

41. An electromagnetic-wave transmitting system comprising in combination an antenna system, means for creating multiperiodic electrical oscillations therein, a circuit associated with the antenna and including a parallel-branch circuit one branch of which acts as an equivalent capacity and the other as an equivalent inductance, the first mentioned circuit including means for adjusting said circuit so as to have a high impedance at the frequency of the oscillation to be radiated and a low impedance at each of the frequencies of a plurality of oscillations that are not to be radiated.

42. An electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillating-arc circuit arranged for creating electrical oscillations therein, a circuit conductively connected to the antenna and attuned so as to have a high impedance at the frequency of the oscillation that is to be radiated and a low impedance at the frequency of one of the oscillations that is not to be radiated, means associated with the last mentioned circuit for rectifying the oscillations absorbed therein and means for impressing the resulting unidirectional current on the arc circuit.

d3. An electromagnetic-wave transmitting system comprising in combination an antenna system, an oscillating-arc circuit ar ranged for .creating electrical oscillations therein, a circuit associated with the antenna and attuned so as to have a high impedance at the frequency of the oscillation to be radiated and a low impedance at each of the frequencies of a plurality of oscillations that are not to be radiated, means associated with the inst mentioned circuit for rectifying the osciiiations absorbed therein and means for impressing the resulting unidirectionai current on the arc circuit.

M. An eiectromagnetic-Wave transmitting system comprising in combination an antenna system, an osciiiating-arc circuit arranged for creating eiectricai osciilations therein circuit condactivety connected to Enna and attuned so as to have a high impedance at the frequency of the oscillation to be radiated and a low impedance at each 013' the frequencies of a plurality of oscillations that are not to be radiated, means associated with the last mentioned circuit for rectifying the oscillations ab sorbed thereiin and means for impressing the ref-suiting unidirectional current on the arc circuit. 7

' 4-5. An electroinagnetic-wave transmitting insensi system comprising in combination an antenna system an osciiiating-arc circuit arranged ior creating eiectricai oscillations therein, a second circuit associated with the antenna and incinding a parallel-branch circuit one i *anch in": which acts an equivalent capacity and the other as an equivalent inductancm said second circuit being ad jnstcd to have a high impedance at the frequency of the oscillation to be 'adiated and a ion in iI-BQit'inCC at each 01 the frequencies or? a plurality oi oscillations that are not to be radiated means associated with said second circuit tor rectifying the osciiiations absorbed therein, and means for impressing the resulting unidic ,tienai current on the arc circuit.

In testinion whereof, I have hereunto subscribed my name this 2nd in}; of October OSCAR C. R005. 

